Metal-working machine.



W. S. DAVENPORT. METAL WORKING MAGHINB. APPLIOATIOH FILED DEO.15, 1905.

Patented July 5,1910.

10 SHEETS-SHEET 1.

Ziwz W. S. DAVENPORT.

METAL WORKING MACHINE.

APPLICATION nun 1:20.15, 1905.

Patented July 5, 1910.

10 SHEETS-SHEET 2.

W. s. DAVENPORT.

METAL WORKING MACHINE.

APPLICATION FILED 11110.15, 1905.

Patented July 5, 1910.

10 SHEETS-SHEET 3.

W. S. wDM/ENPORT. METAL WORKING MACHINE.

. APPLICATION FILED D20. 15, 1!?05. Patented 5, 4

10 SHEETS-SHEET 4.

W. S. DAVENPORT.

METAL WORKING MACHINE.

YAPPLIOATION FILED DEO.15, 1905.

Patented July 5, 1910.

10 SHEETS-811E111: 5.

W. S. DAVENPORT. METAL WORKING MACHINE.

. APPLICATION FILED DBO.15, 1905. Patented 5 10 SHEETS-SHEET 6.

9. M QWMMJ 7 .4 9}

W.- s. DAVENPORT.

METAL WORKING MACHINE.

APPLICATION FILED DEO.15, 1905.

Patented July 5, 1910.

I 10 SHEE'IlS-EHEET 7.

W. S. DAVENPORT. METAL WORKING MACHINE. APPLIUATION FILED 1130.15, 1905.

Patented July 5,1910.

10 SHEETSSHEET 8.

(Juvcul'ot 7 M MW W. S. DAVENPORT. METAL wonmu momma. APPLICATION FILEDDBOQ 16, 1906.

963,691. I Patented July 5,1910.

10 SHEETS-SHEET 9.

W; S. DAVENPORT. METAL WORKING MACHINE.

APPLIOATIOH rn-nn DBO.15, 1905. v

I Patented July 5, 1910.

10 BHEETSSHEET 10.

UNITED STATES PATENT OFFICE.

WILLIAM SQDAVENPORT, 0F SPRINGFIELD, MASSACHUSETTS.

METAL-WORKING MACHINE.

Specification of Letters Patent.

Patented July 5, 1910.

Application filed December 15, 1905. Serial No. 291,872.

' ranged with relation to the various cutting tools that the workcarried by the different spindles is simultaneously presented todifferent tools and the work carried by each spindle is presented insuccession to each of the cutting tools by successive indexing movementsof the work carrying spindles.

The primary object of the present invention is to produce a machine ofthis type in which the idle movements of the machine are eliminated asfar as possible or reduced to .a minimunn'so that the work Ina beproduced at the maximum speed an to also provide a machine in which thedifierent tools may be fed and operatedin such manner thateach shallwork under the conditions requisite for its most efficient and accurateaction, thus insuring work of a high degree of excellence.

A further object is'to provide, for eliminating any possible errors dueto inaccumoms in the construction and arrangement of the work, carryingspindles. which may occur in-the manufactureof the machine or Y maydevelop by reason of wear so that'the accurate duplication of the piecesof work is insured. V

In prior. machines of the multiple spindle type it has been customary toopen the s indle chuck which holds the rod of stock, eed the stock, andthen close the chuck before beginning to index the head which. carries aseries of work spindles. In practicing the present invention the loss oftime involved m thus performing these operations is elimi-. nated byopening and closing the s indle chuck and feedin the rod of stock uringthe indexing of t espindle carrying head. The time. consumed in indexingthe head and in performing the operations of opening and closingthe'chu'ck and feeding the stock,

are also reduced to the minimum and at the same time the indexingefficiently and accurately performed by performing the indexmg by acrank motion which starts the spindle carrying head slowly, moves it athigh speed at the .middle of the indexing and brings the head graduallyto rest at the end of the indexing.

Heretofore it has been customary to drive the spindles of a multiplespindle screw machine by means of a gear arranged in the center of thespindle carrying head and engaging gears connected with the differentspindles, the shaft for the driving gear extending longitudinally of themachine toward the right where it is driven through a. pulley connectedby a belt with the- In this construction the colmtershafting.

1S inconveniently arranged and its ulley and gearing, is such as toprevent the'arrangement of the other parts of the machine to the bestadvantage. In practicing my invention I overcome the objections to thisconstruction and arrangement, by driving the work carrying spindles froman annular or ring gear which surrounds and engages all of the spindlegears and is in turn driven by a pinion engaging the gear teeth formedon its outer periphery. The pinion is in turn driven by a system ofchange gears from a driving pulley arranged atthe back of the machinewhere it does not interfere with the most effective arrangement of otherparts of the machine. In embodying this feature of the invention in anefficient and simple construction I provide the annular gear with aninner bearing surface or tread which engages and is supported by thehubs of the-spindle gears, the bearing tread for the annular gear andthe bearing surfaces of the hubs of the spindle gears coinciding withthe respective pitch ocatlon, as well as the location of the shaftsurfaces of the gears, so that the spindle.

gears form a'roller bearing PEOIKJQhe annular gear. vBy employing changegears for varying the speed of the spindle gear drive, the full beltpower is at .all times utilized which is not the case where conepulleysof varying diameters areemployedas is the renal practice inmultiple spindle screw machmes', and thus the desired speed of thespindles can be readil obtained while maintaining a highly e cient drivefor the spindles.

In multiple spindle machines a considerable portion of the work offorming the articles being made is done by what are termed forming toolswhich are moved radially towardthe center or axis of the work in op-.erating thereon. Since each of the work I carrying spindles presents thework carried thereby to each of the radially moving formin tools anyvariation in the osition actly the same. To overcome any possibleinaccuracy in diiferent pieces of work due to any inaccuracy in themounting of the spindles in the spindle carrying head, I have providedrectifying means for eliminating such inaccuracies and insurin producedfrom the stocfi s indles shall beaccurate orm of re'ctifyin means whichI prefer to employ consists 0 rectifying stops for each of the workcarrying spindlesagainst which carried by the .the tool carriers or somepart connected with them abut when the tools are moved into position'forfinishing the work to size. If a a single cross tool 1s employed in the'machine there will be a single rectifying stop corresponding to eachwork s indle. These stops may be of any form an may be connected wlth,or may be secured to, or may beformed on the s indle head in any manner,so that a stop is rought into operative n Ition or relation when thecorrespon g spindle is brought into operative relation to e tool., Thesestops will, be adjusted or v groimd so that'the cutting edge of theformchange to recti mg tool will be exactly the same distance from thecenter of each work carryin dle'when, the tool isin its advanceposition. 7 -When the stops have been thus ground or adjusted theyremainunaltered unlesskwear u on the machine requires a 7 any inaccuraciesdevelopzd bysuch wear." In c'ase'there are a num r o radially moving inthe machine t e number of rectifying stopsforfle'ach spindle willcorrespond to the number of cross toolsfemp'l yed.

vAnother important feature of the machine embodying my invention istheconstruct-ion and mode of operation which' insures the production ofgood threaded work and also prolongs the'life of the dies for cuttingthe thread. It is desirable. that the speed of rotation of the workrelative to the and also because these tools 'well lubricated. Toaccomplish this end I that the pieces duplicates. .The"

spin;

or cross tools employed cuttin tools should be much slower for the threaing di es'than for other cuttin tools, mainly because the chip taking iseavier cannot be as rotate the spindles carrying the work in the usualdirection for lathe work and rotate the die orta in the same directionbut at a slower speed preferably at about threequarters the speed of thes indle, thus making the relative rotation of the spindle with respectto the die about one-fourth the speed of the spindle. In this way asmooth thread is cut and the life of the die is prolonged the work beingdone .in the same length 0' time that the other toolsvare the reasonthat the feed of the other tools is much slower per revolution of thespindle. For withdrawing or unscrewing the die or tap at the completionof the threading operation, I rotate the die the same direction as thespindle but at a faster speed, preferably at five-fourths of the speedof the spindle the relative speeds bein the same as when threading butwith t e die unscrewing instead of screwing on.

It is important to the commercial success of a machine such as amultiple spindle screw machine that the machine should be ada ted to doalar e variety of work with the east number or special cams and parts andwith as little removal and change of parts as practicable. It is alsoimportant that the threading die or tap should follow thelead of thescrew being cut in order thatthe thread cutting may be accurately anduniformly performed. In practiciclg my invention I provide for properlyfee in 'the die or tap to cut a large number of di erent screw pitcheswith a single feeding camby providing connections between the cam andthe die carrying slide or spindle which. may be adjusted to 'va thespeed with which the die carryin sli e or s indie is advanced by thecam. also app y this adjustable feature to the connections between theother cutting tools and their feed cams with equally goo results inrespect to feedin'g'each tool at the speed which is best calculated forthe eflicient operation of the tool in doing this particular part of thecutting. There is the sameadvantage 1n providm such'an ad'ustmentbetween the cams and t 'e cross sli es or other tool carrying deviceswhich carry the forming tools and operating, for

carrying spindle in I work carrying also provide for such ad'ustment inconnection with these, tools. ith' this adjustment each ofthesetools-can be fed as is best suited to the work to be done by it.The system of adjustable connectionsbetween the cams and the toolsfed'thereby 'is of even greater advantage in enabling the same set ofcams to be employed forvarious pieces of work and in enabing the changesto be readily made in changing the machine to roduce different pieces ofwork. In changing from one piece of work to another the connectionbetween each cam and the tool operated thereby is adjusted to ive thedesired speed to that tool and the c ange-gearing which determines thespeed of rotation of the cam shafts is adjusted to suit the slowest cutor the one requiring the most time to do its work. Thus any piece ofwork within the range of the machine can be made with a single set ofcams and without requiring the removal and replacing of the cams.

Another feature of the invention which contributes to the rapidoperation of the machine and the elimination of lost time in effectingthe various operations under the varying conditions incident to, the useof the machine in doing alarge variety of work, is the stopping .of theshafts which carry the feed cams during the indexing and the starting ofsaid shafts immediately the indexing is completed. .This feature is ofespecial importance in connection with the use of the same set of camsfor doing a variety of work since under such conditions these cams mustrotate much faster in doing some classes of work than in doin and if thecams are to rotate continuously the part ofthe cams which would pass thecam roll during the indexing would vary widely. This would result in aloss of time or of length of feed. By stopping the feeding cams at theend of their working rotation and then starting the indexing and thenagain starting the-feed cams at the end of the indexing, the feed camsmay be rotated quickly for small pieces of work or slowly for largepieces of work and the whole of their .rotation be employed in feedingthe tool carriers and at the same time there will be a minimum loss oftime for indexing the spindle carrying heads.

In embodyin the various features referred to above in a simple andefficient construction I have employed various other features'ofinvention relating more or less to the construction and arrangement ofvarious parts of the machine which, while they are not essential to thebroader features of invention, are of importance in contributing to theefliciency and simplicity of the machine.

All the various features of the invention I will be understood from thefollowing detailed description of the-machine in which I have embodiedthem and will be set forth in the claims. The machine in which I haveembodied the various features of my invention in the forms in which Iprefer to employ them is shown in the accompanying drawings.

Inthese drawings-Figure 1 is a front side elevation of the machine,certain parts others,

being omitted for the sake of clearness. Fig. 2 is a rear sideelevation.- Fig. 3 is an end elevation looking toward the right inFig. 1. Fig. 4 is an end elevation looking toward the left in Fig. 1. Fi55 Fig. 2. Fig. 6-is a section on line 6-43 Fig. 1. Fig. 7 is a sectionon line 7--7 Fig. 1. Fig. 7% is a detail of parts shown in Fig. 7. Fig.8 is a sectionon line 8-8 Fig.

1. Fig. 9 1s a sect-ion on line 9-9. Fig. "3.

Fig. 10 .is a vertical longitudinal. section through the center of themachine. Fig. 11 is an'end elevation of the tool carrying head. Fig. 12is a detail side elevation showing the "arrangement of the feed stop.Fig. 13 is a side elevation showing the devices for introducing new rodsof stock into the work carrying spindles. Fig. 14: is an end elevationlooking toward the right in Fig. 13; and Fig. 15 is a detail of partsshown'in Fig. 13.

The machine shown in the drawings is constructed to operatesimultaneously upon five rods of stock and there is accordingly a seriesof five work carrying spindles A mounted in the spindle carrying head A.The work carrying spindles A are provided with the usual chuck jawswhich are opened to release the rod of stock and are closed to grasp therod of stock by the movement of a chuck sleeve A connected to operatethe chuck jaws in any well known manner. The spindles are also. providedwith feeding tubes A which may be of usual and well known constructionand which are advanced at the time the chuck jaws are opened to advancethe stock and are retracted after the chuck jaws have closed preparatorto the succeeding feeding movement. kince the specific construction ofthe connections between the clutch sleeve A and the chuck jaws and alsothe specific construction of the feeding tube is not material to thepresent invention, and since constructions of this sort are common andWellknown, the details of these constructions have not been illustrated.

The spindle carrying head A is mounted in front and rear bearings A Aand is indexed at proper intervals to bring the work carrying spindlessuccessively into position to present the rods of stock to the varioustools for operating thereon. The mechanism for indexing the spindlecarrying head is bestshown in Figs. 8 and 1Q. As shown in these viewsthe spindle carrying head A g. 5 is a section on line is provided withaseries of projecting teeth or lugs A corresponding in number to thenumber of spindles carried by the head. 'Cooperating with theselugs A isan index pawl A pivoted upon a segmental slide A which is mounted in aguideway A formed in the upper front face of the rear bearing A The pawlis forced yieldingly toward the spindle. carrying head A by a spring A.The pawl carrying slide A is recipto the indexing mechanism.

- co'cfperates with a series of v lugs A secured to the spindle carryingI A. on the other hand proper intervals to disengage and then reengagethe locking arm carries the index pawl A arm into in a yoke at the lowerrocated at proper intervals to efi"ect the indexing by means of a crankpin A connected to the slide A by a connecting rod A. The cra-nkpin ismounted upon a disk A carried by a shaft A which is given a singlerevolution at suitable intervals. When the shaft A is rotated through asingle revolution, the first half revolution from the position indicatedin Fig. .8 into position to engage the next succeeding lug A. During thelast half of the revolution of the shaft A the index pawl acts toadvance the spindle carrying head through one-fifth of a revolution, theindex head being started slowly, rotated rapidlygthrough the middleportion of its moven'ient, and then gradually slowed down as the pawlreaches the end of its .forward movement. The spindle carrying head maythereforebe indexed in a short space of time without shock or jar At theend ofthe indexing movement the spindle carrying head should beaccurately. positioned and locked in position until theinextindexing-movementis to take place. The spindle carrying head is thuspositioned and ocked by means of a locking arm A which locking steps orhead (Figs. 7 and .10). The lockingarm A is provided at its upperendwith a recess for embracing the lugs A and the rear side of this recessis extended beyond the front'side at A" to form a stop which cooperateswith the stops A on the spindle carrying head :to prevent anyover-rotation of" the spindle carrying head at the end of its indexingmovement. The locking arm Amis mounted upon a shaft A and has its lowerend connected with an -arm A b means of a lug A which projects laterallyfromthe arm A into posltion between an adjusting screw' A and a springpressed pin A which are carried by the arm A" and en age opposite sidesof the lug A. The atfjusting screw A forms a rigid connection. betweenthe arm A and. the locking arm is moved positively withthe arm inadirection to disen age the locking arm from the lugs A The springpressed pinforms a yielding connection between the locking arm andtheoperating arm A for, ll'lOVlIlg' the locking position to engage withthe lugs A The operating arm A is operatedat A withthe lugs A by meansof a cam A secured to the 'intermittent shaft A and arranged to' engagecam rolls A A which are mounted end ofthe arm A swings the lockingsucceeding stop lug A plece A forming A so that the lockin arm -ro A?connected. at its and lie on diametrically opposite. sides of the cam A.When the shaft A is rotated l to effect the'indexing the high part A" ofthecam A strikes the roll At just previous to the beginning of theindexin movement of the spindle carrying head an arm A. upward so thatthe stop A is out of the path of the lugs A. After the indexing movementhas carried the lug A past the stop A the cam roll A rides on to thelower part A of the cam A thus advancing the stop A" on the locking arminto the path of the Asthe indexing is completed the lug A bringsup,against the stop A", thus preventing further movement of the spindlecarrying head and just previous to this the high part A of the cam Aengages the cam roll A and forces the locking arm A forward, theconnection between the armvA and the locking arm yielding to allow thatpart of the locking arm in front of the locking recess to ride on thetop of the lug A until the lug-registers, with the recess in when thelocking position indicated spindle carrying It is desirable head be assolid arm is advanced into the in Fig. 7' and locks the head inposition.

that the spindle carrying as possible when the tools are cutting, andprovision is therefore made for positively clamping the head in itsbearmg after each indexing so that it is as solid and rigid as if itwere a part of the body of means for thus clamping the machine. The thespindle carrying head is shown in Figs. 1 and 7. As shown in these viewsthecap the upper 'half of the front bearing for the spindle carryinghead, is bolted to the lower half'of the bearing the rear side ofthehearing by a bolt A.

During the operation of the cutting tools the,

front side of the bearin cap is drawn firmly down so that thespinille-carrying head is firmly and rigidly clamped in the front hearing.During the indexing the pressure upon the front side of the bearing 'capis relieved so that the cap may spring upward sufliciently to releasethe spindle carryin head, the cap being again forced downwar at the endof the mechanism which I employ for thus operatin upon the bearing cap Aconsists of 8. upper end to the front side of the bearing cap andconnected at its lower end to a lever A which is mounted upon a pivotA". A second lever A" is the locking arm,

indexing operation. The i mounted upon the pivot A and is connected withthe lever A by means of a spring A.

This spring is mounted in a recess in the forced downward with apressure do ending upon the tension of the spring such times as this'spring is under tension.

The lever A? is operated to apply and re-,

lieve the pressure upon the clamping lever A by a cam'A secured to theshaft A and provided with a notch A within which the roll A carried bythe lever A normally rests. When the roll A is in the recess A thespring A is under tension and'the spindle carrying head is thereforerigidly clamped by the bearing cap A During this time the roll A inconnection with the recess A also acts as a yielding lock for holdingthe shaft A in position. When the shaft A starts, the side of the recessin the cam A acting against the roll A forces the lever A downwarduntilthe roll passes out of the recess, after which continued movementof the cam allows the arm A to move upward, thus relieving the tensionupon the spring A and thepressure upon the bearing cap for the spindlecarrying head. As the rotation of the shaft A is completed at the end ofthe indexing the roll A on the lever A again enters the re- .cess'Alocking the shaft A in position and also maintaining the pressure uponthe spring A so that the spindle carrying head is again firmly locked inposition by the bearing cap A The work carrying spindles A arecontinuously driven during the operation of the ma-" chine through anannular orring gear A? which surrounds a series of gears A secured tothe spindles and is provided with internal gear teeth engaging the gearsA The annular gear A is provided with an.

internal bearing surface A corresponding to the pitch surface of theinternal gear teeth and the annular gear is supported and carried bybearing hubs A formed onthe gears A which engage the bearing surfaceThe'annular or ring gear is provided with gear teeth upon 1ts outerperiphery and is continuously driven through a gear A which engagesthese gear teeth and is secured to ashaft A arranged back ofand parallelto the spindle carrying head (Figs. .2 and 9). .The shaft A is connectedby change gears A with the main driving shaft B of the machine which iscontinuously driven at a constant speed bya belt passing; over a pulleyB. By changing the gears A the spindle'speed may be varied to suit;

the particular work to be done and the full belt power be utilized underall conditions.

As has already been stated the chuck 'aws of the .spindles are openedand close by reciprocating the chuck sleeves A and the feed of the rodsof stock is effected by reciprocating the feed tube A. In order toeliminate the loss of time incident to the usual lIlQthOdOf' opening andclosing the chuck jaws and feeding the rod of stock, I have providedmechanism for performing these operations during the indexing of thespindle carrying head. While it is not essential to this feature of myinvention that the movement of the spindle carrying head be utilized ineffecting the opening and closing of the jaws of the chuck and the feedof the rod of stock, yet I prefer to embody this feature of my inventionin a construction which thus utilizes the movement of the spindlecarrying head on account of the simplicity of the construction which maybe used and the efficient and accurate action of 'such construction. Asimple and eflicient form of mechanism for thus utilizing the indexingmovement of the spindle carrying head is that which I have embodied inthe machine which is being described. This mechanism is clearly. shownin Figs. 1,, 3 and 10. As shown in these figures each chuck sleeve A isprovided with an annular groove a which is engaged b the ,arms of a yokeaf projecting laterally rom the chuck slide a The'chuck slides a aremounted upon guideways a formed upon a frame a which is secured to therear end of the spindle carrying head A. The feed tube is also providedwith an annular groovea 'which is engaged by the arms of a yoke aproject ing laterally from a feed slide a which is mounted to slide uponthe guideway (L The chuck is opened and closed by a stationary cam (6arranged tov act upon the roll a carried by the chuck slide as thespindle carrying head is indexed. The feed tube slide is advanced tofeed the stock during the time that the chuck jaws are open, by astationary cam a arranged to act upon the cam roll a secured to the feedslide and the feed slide is retracted preparatory to the next feedingmovement by a second stationary cam a arranged to actupon the roll a ofthe feed slide.

The cams for opening and. closing the chuck andfor feeding the stockvare mounted upon a supporting hood a which partially surrounds theframe a, upon which the chuck and feed slides are mounted and thissupporting hood is soconnected with the frame of the machine that it maybe readily moved to carry the operating cams out of.

the path of the cam rolls on the feed and or opening and closing thechuck jaws as hood .shown in Fig. 3 the chuck the upper spindle.

. in the hood a machine for different pieces of work. T131011 1s alsomade for ,quently will not withdraw the feeding tubes for instance insettingup or adjustingPthe rochanging the position of the hood to changethe timing of the feed of the stock with relation to the cutting toolsas is frequently desirable in setting up the machine for differentpieces of work. In order that the supporting hood a may be thus moved oradjusted it is pivoted atone en'd upon a rod a -which passes through theretainlng plate a for the spindle carrying head A and forms one of thebolts for securing said plate to the frame. The other end of thesupporting hood is arranged to rest upon a second rod (1!, which alsoextends throiwh the retaining plate a and forms one of the bolts forsecuring said plate in position. The hood is locked in posltion by meansof a retaining lover a" which is pivoted to the hood and has alowerhooked endarranged to pass beneath the bolt a and rigidly bind thesupportin r hood in position. The lover a is provide( with a han-' dlea. by which the hooked end of the lever may be swung from beneath thebolt a so that the hood may 'be swung up out of position wheneverdesired.

With the arrangement of the supporting operating and feeding cams aresupported in position to effect the feedin of the stock as the Workcarrying spindFe moves from the position at the left of Fi 3 to theposition of I it is desired to effect the feeding of the stock betweenany other two successive positions of the spindle, the position of thesupporting hood may be changed by removing the rods a and a andintroducing them into the holes occupied by the proper bolts 64" for theretaining plate a, the retaining bolts a which are removed to enablethis adjustment-bein introduced into the holes from which the r0 s a anda" have been removed.

In order that the lengths of stock feed may be varied asv desired, thecam o for retracting the feeding tube is adjustably mounted to vary theextent to which the feeding tube is withdrawn during theindexingmovement subsequent to the indexing movement during which thefeed of the r0 takes place. As shown in Fig. 10 the cam a is securedupon a slide a guided in a slot by a clampin nut a. The slide a is owedforwar by a spring a and its forward position is regulated by anadjustlng screw a. If it is desired to operate the machine withoutfeeding the stock as insetting up, the cam a" may be moved forwardtosuch a position that it will not act upon the cam rolls of the feedingslides and conseas the spindle carrying head is indexe The same resultmay be effected 1f deslred by time after one set of ing of heads C andheld in adjusted position is rotated and the stock advanced by thefeeding mechanism. The feeding stop a consists of a rod screw threadedin one of a series of holes a formed in the fixed head for the toolslides or spindles, the position of the stop dependin upon the positionof the hood carrying the feeding and chuck operating cams.

In using multiple spindle machines it is customary toemploy rods ofstock all'of whlch are of-the same length-and it is deslrable that newrods of stock may be introduced into the machine in the least possiblerods has been used up. In order to facilitate the introduction of newrods of stock I have stock carrying pipes G which are connected torotate with the spindle carrying head and are so mounted that-the endsof the pipes adjacent to the spindles may be moved ra iall thus allowingthe introduction of the ro s of stock at the front ends of the pipes.(Figs. 13-15.) These stock carrying pipes O are mounted in a rackconsist- C which are secured to a central shaft C the head 0' beingprovided with open recesses for receivingthe stock ipes, while the headC is provided with c os'ed recesses for retainin the rear ends of thepipes in the head. The pipes are retained ieldingly within the recessesin the head Cl b means of leaf springs C which are secure to a collar Con the shaft C and are connected at their forward ends with the pipes C.By reason of this yielding connection between the i es and supportingrack, the front ends 0? the pi )es may e moved radially outward so thatt e rods of stock may be introduced into the front ends of the pipesafter which the pipes are returned to position by the springs C. Thecentralshaft C of the stock rack is secured to the rear end of the framea which forms a continuation of the spindle head by a in and slotconnection C as indicated in *ig. 10 so that the stock supporting rackrotates with the spindle head. The rear end of the rack is sup ortedupon rolls 0 upon which the head Cl rests as indicated in Figs. 13

I and 14.

In order that the rods of stock introduced into the'stock ipes may beconveniently advanced througll the spindles into pro er position to beacted upon'by the cuttin ofi' tools, the stock carrying rack is providedwith. a device for enga ing the rear ends of the rods of stock an thisdevice is connected with operating devices .whereliy hit may be operatedfrom the front end 0 provided a series of moved forward stock supportingrack which is Within convenient reach of the operator. This stockadvancing device consists in the construction shown, of a disk C securedto the outer end of a rod C which extends forward through the shaft 0which is made hollow to recelve it. At its front end the rod C isconnected with a sleeve C by means of a pin C which extends through thesleeve and rod and plays in slots formed in the hollow shaft C Thesleeve (1 ismounted spindle whose chuck is open radially out-' ward andintroduces a'rod of stock into the tube,'th'e' end of the rod of stockstriking the disk C and forcin it to the left until 1ts movement isarreste as the introduction of the rod of stock is completed. The pipe Cis then returned to normal position bringing the front end of the rod ofstock into line with the bore of the feeding tube in the correspondinspindle. The slide 0 is y the operator, thus advancingthe stock engagingdisk C which drives the rod forward into the spindle of the machinethrough the feed'tube and the chuck just far enough so thatthe cuttingoff tool will finish the-end of the rod of stock. The machine is thenturned through a cycle and then another bar. of stock inserted in thesame manner. After the rods of stock have been thus introduced, the nextfeed of the stock will result in the Productionof perfect pieces ofvwork.

By the indexing movements of the spindle carrying head each spindle ispresented in succession to tools mounted in carriers arranged to moveradially of the Work held by the spindles. As indicated in Fig. 6 themachine being described is provided with 4 cross tools and these toolsare mounted in 4 carriers D D D D, the carriers D D being pivotedcarriers, while the carriers D D are in the form of cross slides aravranged in suitable ways in the bed of the machine. Each of the crosstools acts upon the work carried b each of the spindles and if one ofthe spin les should be so mounted that it is nearer the axis of thespindle headthan one or the other of the spindles and the cross toolshould be advanced to exactly the same position when operating upon thework carried by each of the two spindles, then the 'work carried by thespindle which is nearer to the axis of ,,the spindle head would befinished to a larger diameter by the cross tool than would the workcarried by the other spindle.- The two pieces of work formed fromtheadiflerent rods of stock carequal wear upon the parts,

sponding to each cross tool carrier.

ried by the two spindles would not therefore be exact duplicates of eachother. In other vdue to unavoidable inaccuracies in constructing themachine, or due to inaccuracies which maybe. developed b' reason of un-T have provided a rectifying stop for each spindle conif- T e rectifyingstops for cooperating with the cross tool carrier D consist of a seriesof pins cl projecting radially from the disk D which is secured in thefront end of the spindle head; There is a pin (1 corresponding to eachof the spindles and these pins are so arranged that they are engaged bya cooperating stop d on the tool carrier D. In building the machinethese pins a are words, slight inaccuracies in the mounting adjusted orground off so that the cutting edge ofthe tool carried by the carrier Dwill be exactly the same distance from the .center of each spindle whenthe stop at is pressed against the corresponding pin d.

For instance if the forming tool on the carrier D is adjusted so that itwill turn the work carrier by one of the spindles about ,4; of an inchin diameter when the stop (1 is in engagement with the corresponding pind and it is found that the tool forms the work carried by the succeedingspindle corresponding pin cl for the succeeding spindle, then this pin03 is adjusted or ground so that the tool will form the work on thisspindle to exactly it of an inch in diameter when the stop (I? is inengagement with the pin. Thus each of the pins is ground or adjusted sothat the stock carried by each of the spindlesis turned to exactly 5; ofan inch by the action of the tool carried by the tool carrier D. Thestop pins dare then left permanently in this adjustment unless Wear uponthe machine develops some inaccuracy in which case the pins arereadjusted or reground to rectify such inaccu:

racy. The rectifying stops for the tool carrier D consist of pins d andare arranged to cooperate with a stop d on the tool carrier. Therectifying stops for the carriers D and D consist of pinsd (2*respectively arranged to cooperate with stops (Z d on the tool carriersD D respectively.

The stops carried by the tool carriers consist of adjustable screw rodswhich may be adjusted. according to the position which the forming toolsshould occupy when in ad-' D. The link 1) is pivoted-at front and backof the machine andare driven in unison by mechanism which will behereinafter described. The cams D D D and D are all of the same form andthe devices for connecting the cams with the respective tool carriersare substantial duplicates in I construction and mode of operation. Adescription of the construction and mode of operation of the devices foroperating the cross slide D w1ll therefore be sutlicient for anunderstanding of this mechanism.

As shown in Fig. 6 the connections between the cam D and the cross slideI) comprise a lever D which is pivoted at D and' connected with thecross slide D? by a link one end to the cross slide D and at the otherend is pivoted to a block I) securedto the lever D The blockfD isconnected with the lever D3 by means of a bolt D and nut The bolt passesthrough the block D and the head of the bolt lies within a T- shapedslot which extends longitudinally of so that the radial of the. levermay be varied by sliding the block along the upper arm of the lever andthen clamping the block in adjusted position by tightening the nut D Bymeans of this adjustable connection between the'lever D and the link Dthe speed of the movement imparted to the cross slide D and the distancethrough which it is moved by the cam D may be varied according to thecharacter of the work tool carried by the cross slide. The link D isadjustable in length, being formed of two oppositely screw-threaded rodsconnected by a turn buckle so that by turning the turn buckle the lengthof the link may be increased or diminished to bring the tool carried bythe cross slide into proper relation with the axis of the work carryingspindle when the tool slide is in its advanced position. The connectionsbetween the cam D and the cross slide are adjusted so that the stop d ispressed firmly against the rectifying stops d when the cross slide is inits advanced position and the spring in'the connections is suflicient tocompensate for any slightvariation which there may be in the advanceposition of the slide when the stop 03 is in engagement with thedifferent rectifying stops.

By reason of the adjustable connections between the cam D and the crossslide D the same cam may be used for operating different tools and thefeed of the tool be regulated according to the requirements of the workbeing done, with the result that a change from one piece of work toanother within the capacity of the machine does not require the removalof the cam D and the replacing of it with another camsuitable for theeflicient action of the particular tool to tools carried by a being doneby the be used and the particular work to be done, as is necessary withthe usual construction of screw machines.

The rods of stock carried by the spindles are also presente successivelyby the spindles in position to be acted upon by cutting series of "toolslides or spindles arranged in axial alinement with the work carryingspindles and arranged to'move longitudinally of the work. These toolcarrying spindles or slides as shown consist of 4 spindles E which donot rotate and a tap or die carrying spindle E which is mounted torotate in a manner to be described, the number of tool carrying spindlesthus corresponding in number to the number of work carrying spindles inthe spindle carrying head. The tool carrying spindles are mounted in ahead E which 'is rigidly held in bearings E E in alinement with thebearings for the spindle carrying head A. The tool carryin spindles areprovided at their forward en s with the usual clamping devices E forretaining the tools in the forward ends'of the s indles. The nonrotary sindles E are held from rotation by means 0? keys E which en age slotsformed in the spindles. The spindles are operated by means of a seriesof cams ET-secured to a cam shaft E? which is geared to and rotates inunison with the cam shafts D D for the cross tool carriers. Theconnections between the tool carrying spindles and the operating cams Eare the same in construction and mode of operation as the connectionsbetween the cross tool; carriers and their operating cams. Theseconnections consist of levers E arranged to engage the cams and providedwith slots in their up er arms in which are mounted adjusta le blocks Econnected by means of adjustable links E with the rear ends of the toolspindles. The tool spindles are forced rearwardly so as to maintain thecam rolls on the levers in engagement with their cams by means ofsprings E mounted within the spindles. These springs are inter osedbetween a plug E at the rear en of the spindle and a plug E mountedwithin the spindle and arranged to engage a pin E which extends throu hslots formed in the spindle and is carried by a collar E. Fig. 10.) Thecollar E is loosely mounted on the spindle and is forced against thedisk E which forms the front end of the tool spindle head by the s ringE. In the case of the'non-rotary too l spindles E the links E arepivoted directly to cars formed on the rear end of the'spindle- In thecase of the rotary s indle E oted to a cy indrical piece E held withinthe rear end of the spindle by a collar E having'an inward projectingflange which engages the rear end of the iece E and retains it withinthe end o the spindle.

the link E is piv- While I have shown but one rot y pi dle dles may beadvanced at the speed and through the distance and smoothly cut and thedie requisite for the proper operation of the articular tool carriedthereby and the spindles or slides may be operated by the same set ofcams in doing the various pieces of work within the capacity of themachine. .In the case of the die carrying spindle or' spindles theadjustable connections between the spindle and spindle advancing camenables the feed of the spindle to be adjusted according to the pitch ofthe screw being cut andthe same cam may be employed for cutting thevarious threads required in doing, different pieces of work. I

In cutting threads the'spindle'E is rotated in the same direction as thework carrying spindle both .duringthe threadin operation and during therunning off 0 the die or tap, the speed of rotation being retardedduring .one operation and accelerated during the other. With this modeof operation there is no stopping or reversin of either the spindle ordie and no vio ent change of the direction 'ofrotation of any part andthus the threads may be accurately or tap run 0 without undue wear or mury to thethreading tool and the threading be "performed under the mostfavorable conditions. The mechanism for thus rotati?- the die carryingspindle E is shown in gs. 2, 5 and 10;. As shown in Fig. 10' therearetwo gears e e of different diameters secured to the spindle E andthese gears are engaged by gears e c loosely mounted on a shaft e. Theshaft e extends longitudinallythrough the axis of the spindle carryinhead A and throu h the tool spindle head E and is connected hy with thespindle gears A The thus continuously driven through a gear e shaft 8*1s the annular gear A and the spindle gears;

' Either one or the other. of the gears e e may be connectedwith theshaft 0* by-means of the clutch e keyedto rotate with the shaft 6 andprovided'with clutch facesarjranged to engage corresponding clutchfacesv on the gears 6 6 When-the clutch e is in engagement with the gear6 the diecarrying spindle will be rotated in the same-direction as'thework carrying spindles but at a slower speed and when the clutch. is inen*. gagement with the gear 6 the die carrying spindle will be rotated nthe same directipn as the work carrying spindle but at a faster Speed.In cutting right handed threads the die spindle E is rotated in the samedirection as the work carrying spindle and at a slower speed "during thethreading: and is work carrying spindle but at a slower-speed.

cams for the cross 'a pin (3 arranged to engage 6 passes the point ofthe V,

clutch from the gear (2 and reengag- 115 rotated in the same directionand at a higher speed during the unthreading In on left handed threadsthe relative spee s" would be the reverse, that is to say during thethreading operation the die carrying spindle wouldrotate in the samedirection as the work carrying spindle and at a-higher speed and duringthe unthreadin'g operation would rotate in the same direction as the Theclutch e is shifted at the proper intervals to throw the gears e and ainto and out of operation through the movement of a yoke I e which issecured to a rock shaft 6 and is provided with pins'e engagingan-annu'lar groove 6 in the clutch. The rock: shaft 6 is operated bycams e secured to a cam drum carried by the cam shaftlD on which thetools are mounted. The connections between the cams e and the rock shafte" consist of a lever e pivoted upon a rock shaft and provided at itslower end with a cam roll which is acted uponby the cams e The lever eis provided with one side or the other of.a V-shaped plate e The plate ois formed on the lower end of a rod 6 which is mounted in an arm (2secured tothe rock shaft e'the rod being forced downward by a spring a,By this construction when the lever e is moved toward the right in Fig.2 for: instance the in 6 acts against the side of the V-shaped p ate eforcin pin 0 upward against the tension 0 spring 0 until the in ofv heV. During t is time the clutch willremain in engagement with the ear 6As soonas the pm 6 passes the point of the V the downward pressure ofthe'spring'will force the V-shaped plate 6 downward and the right sideof the V acting against the pin 6 w ll cause the arm e to be suddenlyshiftedtowa-rd the left, thus disengaging the clutch from the gear 6 andengaging it with the gear a When the lever e is shifted in the op ositedirection the same, action will take p ace exceptthat the arm 6 W111suddenly shifted toward the right as the pm I thus disengaging the ingit with the gear 6?, the parts being then in the position shown in Flg.2.

In order to avoid the loss of time which would result from continuouslrotatin the cam shafts for efiecting cutting tools, I have providedmechamsm for stop ing the rotation of the cam shafts at the Beginning ofthe indexing of the spindle head and then starting the cam shafts againat the end of the indexing. 125' The form of mechanism which I prefer toemploy for this purposeis shown in Figs.

1. 2, 4; 5 and 10. The

I cam shafts D D? which carry the came for the cross tool carI-.

riers and the cam Shaft E which carries the-1 80 they 6 passes the point100 the ceding of the scribed, the speed of on a gear F clutch member FI as " gear F the tension of the spring U cams for o dles or sli eratingthe tool carryin spines, are connected toget er by bevel gears F'sothatthe shafts rotate in unison and these shafts are driven throughworms F secured to a worm shaft F and engaging worm wheels F to the camshafts D D.

F is driven through a gears F from a sha F tends transversely of thealinement with a shaftF which are secured The worm shaft system ofchange The shaft F exmachine and is in wh1ch is connected by bevel gearsF with the index shaft A; During the operation of the cuttmg tools theshaft F is the cam shafts throu varied to suit the being done by Themechanism continuously rotated and drives b4 the glfarin e cam srequirements of the work means of the change ears F. for driving the saft F deing afts consists of a clutch member F secured to the shaft andengaged by a clutch member shaft F gear F is en by a pinion securedrotating shaft F The gear F with a second clutch member F engage aclutch member shaft F when'the gear F it from the clutch F enga e gear Fis shifted clutch F which is loosely mounted on the and is held inengagement with the .by a spring F". The aged and continuously driven toa contmuously is provided arranged to secured to the is shifted to dis-The clutch to disengage it from the and thus stop the rotation of thecam shafts and to engage it with the clutch member F and thus throw theindexing mechanism into operation by a mechanism which is controlledfrom one of the tool slides. ing mechanism forthe operation and throwinganism for the indexin eration, are shown in ing the operation of theclutch member F the (:peration of the a trip 7 carried The devices forthrowing the driv cam shafts out' of the drivin .mechmechanism mtoopig's. 5 and 10'. Durthe cutting tools the din engagement with by thesprln F As cutting too s is' comby one of the tool spindles E operates alatch f and releases a s ring ressed lever ri es ,at its lowerend leveris-released the The lever, '7 cara pin 7" and when the spring f rockssaid lever on its pivot c'arrylngthe in f into an annular groove 7 whichis periphery of the clutch memberFF.

clutchm'ember F i which projects across ormed in the The is providedwith a cam the annular groove f and extends to the rear side of theclutch member; When the pin 7 enters the groove 7' it'is brought intothe path of the cam f and when this cam init acts against the in ftovfard theleft ing the clutch gear from its rotation rides toforce theclutch in Fig. 5, against F thus disengagthe clutch member spin 1e E'andpm 7". When trip f will ride latch is una 7 ing the clutch G gagementwith theclutch member F The shaft F and the index shaft F now continueto rotate until they have made a single revolution. As they completethis revolution a projecting finger f on the clutch member F actsagainst a finger f onthe lever f forcing the lever back and ca 'ing thepm f out of engagement with the rear side of the clutch member'F" clutchmember and gear F are returned by the spring F into engagement with theclutch member F9 thus stopping the rotation of the index shaft andstarting up the cam shafts. When the lever ff is thus swung back againstthe tension 0 its sprin by the fingers f f itsvupper end is engage bythe latchf and the lever is retained in thispo sition until it is againreleased by the action of the trip f on the succeeding return move mentof the toolslide or s lndle E. The trip is pivoted to a block. securedto the normally rests against a stop the tool slide is advanced the overthe end of the latch g, ng on its 'ivot so that t e ected. On t e returnmovementof the tool spindle however, the pin prevents the "swin gmovement of the trip the tr p swin 1n the opposite direction so that itwill act against the latch f and release the arm f;

The shaft F through which the cam shafts and the indexing mechanism" aredriven, is continuously rotated from a shaft G arran ed at the back ofthe machine and oonnecte with the shaft G. The shaft G is driven fromthe main driving shaft B engages a gear G 4 and disconnected with theshaft G at the will of the operator throu h 'a clutch G. The clutch G isnormally eldx'inengagement with the gear G so ,that. the partsdriven-from'the shaft G areo rated from the drivin shaft by means ofspring G inter os'ed tween the clutch G and a collar on the shaft G. Theclutch G may be disengaged to throw the shaft G out of action of a rod Gengagin' the clutch and arranged to be 0 rate u on by a cam G" which issecur to a roc in transversely of the machine viged at its front endwith an. y tin handle G When the operating handle G is thrown into theposition indicated in Fig.

2 the bam Gwill act upon the rodG forcso that the F by bevel gears atthewill of the operator by means shaft G" extendeproout of engagement with

